Patent · US Expired

Preparation of bead-form expandable styrene polymers having improved expandability

US5616624A · kind A · utility

1Cited by

1References

4Claims

0Family size

Assignee

BASF SE

Inventors

Michael Witt · Ludwigshafen, DE
Dietrich Scherzer · Neustadt, DE
Klaus Hahn · Lampertheim, DE
Dieter Naegele · Worms, DE

Key dates

Filing date	Aug 2, 1995
Grant date	Apr 1, 1997
Priority date	—
Expiry date	Aug 2, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2325/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the preparation of bead-form expandable styrene polymers by polymerizing styrene, if desired in the presence of further comonomers, in aqueous suspension in the presence of organic molecular colloids as suspension stabilizers and conventional styrene-soluble polymerization catalysts and with addition of a blowing agent and, if desired, conventional additives in effective amounts, wherein the aqueous suspension contains at least one olefinically unsaturated carboxylic acid or a water-soluble salt thereof in an amount, based on the organic phase, of from 0.002 to 0.3% by weight of carboxylate anions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.